Redundant config data due to each implementation storing a copy

[met4000]

WML/src/main/include/devices/DeployableDevice.h

Lines 40 to 41 in 9f6f880

	private:
	DeployableDeviceConfig _config;

As the config isn't stored as a pointer (and is private), all implementations of DeployableDevice have to store an additional copy of their own config, which contains redundant data also stored in DeployableDevice::config - much more memory is used than needed, especially if the config contains non-pointer types complex types.

This problem isn't limited to just DeployableDevice (I used it as an example), but overall it shouldn't take too long to fix and is also backwards compatible.